Pump Gear Crankshaft Angular Offset Design
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Solution Overview
Problem
Existing multiple cylinder pump mechanisms require large space and long crankshafts for high delivery volumes, leading to high production and storage costs, and suffer from restricted accessibility and unsatisfactory space usage due to radial cylinder arrangements.
Innovation Solution
A pump mechanism with cylinders positioned around a crankshaft at predetermined angles, where each piston is connected to a connecting rod on its own crank with a specific angular offset, ensuring uniform phase shifts and allowing for a compact design with improved accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If cylinders are arranged radially around the crankshaft to reduce crankshaft length, then the pump becomes more compact, but accessibility of rear cylinders is significantly restricted
Solution Approach 1:
The patent transitions from a radial arrangement (2D projection) to a three-dimensional configuration where cylinders are offset along the crankshaft axis. This dimensional change allows cylinders to be positioned at different heights, improving accessibility while maintaining compact footprint. The connecting rods are correspondingly offset to connect to cranks at different positions on the crankshaft.
2Ease of operation
If cylinders are arranged in parallel horizontally on a crankshaft, then accessibility is improved, but large cylinder intervals require a long crankshaft increasing production costs
Solution Approach 1:
The patent moves from a horizontal parallel arrangement to a vertical arrangement with cylinders offset along the crankshaft axis. This repositioning in the vertical dimension reduces the horizontal footprint and allows for a shorter crankshaft while maintaining good accessibility of all cylinders.
Solution Approach 2:
The patent employs an asymmetric arrangement where cylinders are positioned at different angular intervals and offset along the crankshaft axis rather than being uniformly distributed. This asymmetric configuration optimizes both space utilization and accessibility while balancing the torque curve through specific angular relationships.
3Productivity
If cylinders are arranged radially to achieve uniform delivery superposition, then delivery uniformity is improved, but the pump becomes protrusive and requires special piping
Solution Approach 1:
By offsetting cylinders along the crankshaft axis rather than arranging them radially in a single plane, the patent creates a three-dimensional configuration that reduces the protruding footprint. This spatial rearrangement simplifies piping requirements while maintaining uniform delivery superposition through carefully selected angular offsets and phase relationships.
Data Source
AI summary
A pump mechanism having multiple cylinders, whose axes are situated around a crankshaft to enclose predetermined angles, and whose pistons are each functionally connected to a connecting rod mounted on a crank on the crankshaft, each connecting rod being mounted on its own crank and the cranks having a predetermined angular offset to one another. This angular offset of the cranks is selected in accordance with the angle which the cylinder axes enclose in such a way that the phase shifts between each two pistons of the cylinders actuated in sequence during a rotation of the crankshaft are equally large.